I was expecting a very similar shell to the VX with a faster and more precise bass due to the Balanced Armature in that frequency... I was gladly surprised that its shell is significantly smaller and more comfy than the VX (my main complain about its previous flagship during long listening sections) making its fit just perfect for me. Graphs showed a flat bass response and a boisted upper mids so I was expecting it to be a bit shoity and lacking some bass for my taste, I was wrong, it has a nice bass while not artificially boosted and it isnt shouty as the graphs suggest so I also had a glad surprise in the sound department. Still havent had enough time to compare with other IEMs but It is a balanced sounding IEM with rich details, Kudos for TRN.